Casing-tongs.



W. G. JACKSON.

CASING TONGS.

APPLICATION FILED APR. 22, 1912 1,046,596; I Patented Dec. 10, 1912.

ATTORNEY UNITED STATE$ PATENT QFFICE.

WILLIAM G. JACKSON, 0F MARICOPA, CALIFORNIA.

CASING-TONGS.

Application filed April 22, 1912.

To all whom it may concern:

Be it known that I, WILLIAM G. JACKSON, a citizen of the United States,residing at Maricopa, in the county of Kern and State of California,have invented new and useful Improvements in Casing-Tongs, of which thefollowing is a specification.

This invention relates to improvements in.

casing tongs used especially for screwing and unscrewing the separatesections of well casings and pipe lines.

The object of my invention is to provide casing tongs the lever of whichcan be attached to a reciprocating engine, and which can be very quicklyand readily adapted for sections of all sizes.

In the accompanying drawing, Figure 1 is a side elevation of the casingtongs shown in use on a casing section; Fig. 2 is a transverse sectionalview of the same.

Referring to the drawing, 1 indicates the main body of the tongs, havingupper and lower plane parallel surfaces, and formed with an aperture 2extending from one side to the other midway between said surfaces. At acentral part of said aperture there is pivoted therein, by a pivot bolt3 passing entirely through the body, a lever 4, the aperture being madeflaring at both ends to permit of the vibration of the lever therein.Pivotally attached to the outer end of the short arm of the lever is achain 6, preferably of the form common in sprocket chains, that is,consisting of double and single links pivoted together by pivots 7. Itdiffers, however, from the ordinary sprocket chain in that each pivot atone terminal portion of the chain projects a considerable distance oneach side of the link.

The body of the tongs is extended on one side of said pivot and isformed with a groove 8 1n the outer side of said extension, which isthus in effect formed into two jaws. The inner side of said extension isconcaved to fit against the outer surface of the casing 13 and is formedwith teeth or corrugations 9. The chain, having been passed around thecasing, is inserted in the groove between said jaws and is drawn astightly around the casing as possible so as to permit one of saidextended pivots to be inserted behind two shoulders 11 formed on thebody on opposite sides of said groove and directed to- Specification ofLetters latent.

Patented Dec. 10, 1912.

Serial No. 692,392.

motion. Upon the motion in one direction of the engine and lever, thechain is tightened around the casing and grips it so that it is turnedwith the lever. Upon the reciprocating motion of the engine in theopposite direction, the lever can be drawn back by hand, so that thechain is then loose around the casing, and can be drawn back to itsfirst position, so that, upon another movement in the firstnameddirection of the engine, the chain is again tightened and the casing isagain turned.

I claim A casing tongs comprising a body portion having an aperturetherethrough and an extension having on its outer side a groove formingjaws the inner side being concave and provided with teeth, a leverextending through said aperture and pivoted to said body, a chain insaid groove one end of which is attached to said lever, said chainconsisting of links and pivots, the pivots extending outside the links,and the body being formed on each side of said groove with shouldersadapted to engage the extended ends of said pivots, said body being alsoformed with registering apertures, and a pin through said apertures,said apertures being so located that the pin passes outside the chainwhen in said groove.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

WILLIAM G. JACKSON.

Witnesses:

FRANCIS M. WRIGHT, D. B. RICHARDS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

